Figure 1. Cervical magnetic resonance imaging (MRI) before operation. (A–E) Two months after onset, C3–C7 disc herniation with cervical degeneration, posterior spondylolisthesis (degree I) with spinal stenosis, high-signal intensity area from medulla oblongata to T1 vertebral levels on T2-weighted MRI (arrows). No high-signal enhancement was found on T1-MRI with gadolinium. (F–J) Three months after onset, marked progression of T2-weighted high-signal area over the oblongata to T1 vertebral levels and has spread to the pons (arrows).